/* 过渡 */
.fade-enter{
    visibility: hidden;
    opacity: 0;
}
.fade-leave-to{
    display: none;
}
.fade-enter-active,
.fade-leave-active{
    transition: opacity .5s ease;
}
.fade-enter-to,
.fade-leave{
    visibility: visible;
    opacity: 1;
}
/* 清除浮动 */
.clearfix:after{ 
    content: ""; 
    display: block; 
    height: 0; 
    clear: both; 
    visibility: hidden;
}
.clearfix{ 
    *zoom: 1; 
}
